[完全版] 新人研修や本では教えてくれないJava！

by Masatoshi Tada

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ᶃ ৽ਓݚमͰڭ͑Δ+BWBɺڭ͑ͳ͍+BWB ᶄ ϥΠϒϥϦΛ؆୯ʹ࢖͓͏ʂϏϧυπʔϧ.BWFO ᶅ 8FCࡾछͷਆثʂ8FCϑϨʔϜϫʔΫɾ  %*ίϯςφɾ03Ϛούʔ ᶆ ϑϨʔϜϫʔΫͷ࢓૊ΈΛ஌Ζ͏ʂ  ϦϑϨΫγϣϯͱΞϊςʔγϣϯ ᶇ τϥϒϧγϡʔςΟϯάʹඞਢʂ  ϩΪϯάϥΠϒϥϦ-PHCBDL ᶈ ͜Ε͔ΒͲ͏ֶश͢Δ͔ʁ 5

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ұൠతͳ+BWB৽ਓݚम લ൒ ᶃ ίϯϐϡʔλʔͷجૅʢʙ೔ؒʣ ▸ ίϯϐϡʔλʔͷେػೳɺωοτϫʔΫɺ%#42- ᶄ ϓϩάϥϛϯάͷجૅʢʙ೔ؒʣ ▸ ม਺ɺ৚݅෼ذɺ܁Γฦ͠ɺ഑ྻɺϝιου ᶅ ΦϒδΣΫτࢦ޲ʢʙ೔ؒʣ ▸ ΫϥεɺίϯετϥΫλɺΦʔόʔϩʔυɺܧঝɺΞΫηεम ০ࢠɺΦʔόʔϥΠυɺந৅ΫϥεɺΠϯλϑΣʔε 8

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ұൠతͳ+BWB৽ਓݚम ޙ൒ ᶆ ඪ४"1*ʢʙ೔ؒʣ ▸ 4USJOHɺϥούʔΫϥεɺ%BUFɺ4JNQMF%BUF'PSNBUɺ  'JMF3FBEFS8SJUFSɺ"SSBZ-JTUɺ)BTI.BQ ᶇ 8FCΞϓϦέʔγϣϯʢʙ೔ؒʣ ▸ αʔϒϨοτɺ+41ɺ+%#$ ᶈ ։ൃԋशʢʙ೔ؒʣ ‣ ʙਓͷάϧʔϓͰͷٖࣅϓϩδΣΫτ 9

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ৽ਓݚमͰ͸ڭΘΒͳ͍ ͜ͱ͕ଟ͍ +BWB ▸ ྻڍܕ &OVN ▸ ֦ுGPSจ ▸ USZXJUISFTPVSDFT ▸ ϥϜμࣜ4USFBN"1* ▸ %BUFBOE5JNF"1* 10 Java SE 5Ҏ߱ͷ৽ػೳ͸ ΄ͱΜͲशΘͳ͍ʂ ※ݱࡏ͸Java SE 8͕࠷৽ ※δΣωϦΫεͱΦʔτϘΫγϯά͸ ɹश͏͜ͱ͕ଟ͍

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ໰୊఺ɿόʔδϣϯΞοϓͲ͏͢Δʁ ▸ ϥΠϒϥϦ"ͷόʔδϣϯΛ্͛Δͱɺґଘ͢Δ ϥΠϒϥϦ΋ҶͮΔࣜʹ্͛ͳ͚Ε͹ͳΒͳ͍  ˠຖճɺಉ͡ௐࠪΛ͢Δͷʁ 17 ϥΠϒϥϦA 1.0->1.1 ϥΠϒϥϦB 2.1->2.3 ϥΠϒϥϦC 1.1.1->1.1.2 ϥΠϒϥϦD 4.3.0->5.0.0 ϥΠϒϥϦE 2.2.2->2.2.2

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 .BWFO$FOUSBM3FQPTJUPSZ ▸ Πϯλʔωοτ্ͷɺ΄ͱ ΜͲͷΦʔϓϯιʔεϥΠ ϒϥϦ͕ू·͍ͬͯΔ৔ॴ ▸ 9.-ʹࢦఆͨ͠ϥΠϒϥϦ ͸ɺ͔͜͜Βμ΢ϯϩʔυ ͞ΕΔ ▸ IUUQTFBSDINBWFOPSH Ͱݕࡧ΋Մೳ 19 ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ ϥΠϒϥϦ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +"3΁ͷύοέʔδϯά ▸ ίϚϯυϓϩϯϓτͰQPNYNM ͕͋ΔϑΥϧμʹҠಈ  ˠmvn packageίϚϯυΛ࣮ߦ  ˠUBSHFUϑΥϧμ͕࡞੒͞Εɺ  ɹͦͷதʹ+"3ϑΝΠϧ͕  ɹ࡞੒͞ΕΔ ▸ લʹ࡞੒ͨ͠+"3ͳͲΛ࡟আͯ͠ ࠶ύοέʔδϯά͍ͨ͠৔߹͸ mvn clean packageΛ࣮ߦ 30

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 $ jar -tf target/maven-sample-1.0-SNAPSHOT.jar com/example/entity/Employee.class com/example/repository/EmployeeRepository.class jdbc.properties ϑΥϧμߏ଄ͱ+"3ύοέʔδϯά 33 src/main/java ͷத਎ src/main/resources ͷத਎ JARϑΝΠϧͷத਎ΛݟΔίϚϯυ ※Ұ෦লུ͍ͯ͠·͢

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCΞϓϦέʔγϣϯͷϑΥϧμߏ଄ 35 src main test java resources java resources ιʔείʔυ ઃఆϑΝΠϧ ςετ༻ιʔείʔυ ςετ༻ઃఆϑΝΠϧ webapp WEB-INF web.xml JSPɺHTMLͳͲ ※εϖʔεͷ౎߹্ɺϓϩδΣΫτϑΥϧμͱpom.xml͸লུ͍ͯ͠·͢

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 $ jar -tf target/maven-sample-1.0-SNAPSHOT.war index.jsp WEB-INF/web.xml WEB-INF/classes/com/example/entity/Employee.class WEB-INF/classes/com/example/repository/EmployeeRepository.class WEB-INF/classes/jdbc.properties WEB-INF/lib/commons-logging-1.2.jar WEB-INF/lib/spring-beans-4.3.4.RELEASE.jar WEB-INF/lib/spring-core-4.3.4.RELEASE.jar WEB-INF/lib/spring-jdbc-4.3.4.RELEASE.jar WEB-INF/lib/spring-tx-4.3.4.RELEASE.jar ϑΥϧμߏ଄ͱ8"3ύοέʔδϯά 37 src/main/java, src/main/resources pom.xmlʹࢦఆͨ͠ϥΠϒϥϦ ʢҶͮΔࣜʹඞཁͳ΋ͷ΋ؚΉʣ ※Ұ෦লུ͍ͯ͠·͢ src/main/webapp

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 TDPQF͸ओʹछྨ 39 scope໊ ίϯύΠϧ ࣮ߦ ςετ WARʹؚ·ΕΔ compile (σϑΥϧτ) ̋ ̋ ̋ ̋ provided ̋ × × × runtime × ̋ ̋ ̋ test × × ̋ × ※΋͏1ͭʮsystemʯͱ͍͏scope͕͋Γ·͕͢ɺ͋·Γଟ༻͠ͳ͍ͷͰࠓճ͸આ໌͠·ͤΜ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +%#$ͷ໰୊఺ ▸ ࣅͨΑ͏ͳίʔυΛຖճ ॻ͔ͳ͚Ε͹ͳΒͳ͍ ▸ ίωΫγϣϯऔಘɺ  εςʔτϝϯτऔಘɺ  ύϥϝʔλࢦఆɺ  ݁Ռηοτͷऔಘɺ  ৚݅෼ذͯ͠ɺ  ֤ྻ͔Β஋औΓग़͠ɺ  ΤϯςΟςΟʹ୅ೖɺɾɾɾ 46 public Employee findById(Integer id) { Employee employee = null; // ໭Γ஋ String sql = "SELECT name, department_id," + " joined_date FROM employee WHERE id = ?"; try (Connection con = DriverManager .getConnection(URL, USER, PASSWORD); PreparedStatement ps = con.prepareStatement(sql)) { ps.setInt(1, id); ResultSet rs = ps.executeQuery(); if (rs.next()) { String name = rs.getString("name"); int departmentId = rs.getInt("department_id"); Date joinedDate = rs.getDate("joined_date"); employee = new Employee(); employee.setId(id); employee.setName(name); employee.setDepartmentId(departmentId); employee.setJoinedDate(joinedDate); } } catch (SQLException e) { // ຊདྷ͸ϩάग़ྗ΍ྫ֎ͷ࠶εϩʔΛߦ͏ e.printStackTrace(); } return employee; } ※ ※ʮϘΠϥʔϓϨʔτίʔυʯͱݺ͹ΕΔ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 8FCϑϨʔϜϫʔΫͷେ·͔ͳ࢓૊Έ ▸ ϑϩϯτίϯτϩʔϥʔ ͱݺ͹ΕΔαʔϒϨοτ ͕શͯͷϦΫΤετΛड ͚औΓɺ֤ίϯτϩʔϥʔ ʹॲཧΛৼΓ෼͚Δ 49 ϑϩϯτ ίϯτϩʔϥʔ ʢαʔϒϨοτʣ ίϯτ ϩʔϥʔ ίϯτ ϩʔϥʔ ίϯτ ϩʔϥʔ ϦΫΤετ ※ϑϨʔϜϫʔΫ ಺ͷΫϥε ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 छྨͷ8FCϑϨʔϜϫʔΫ ᶄίϯϙʔωϯτϕʔε  ϑϨʔϜϫʔΫ ▸ /&5΍"OESPJEͳͲ(6* ΞϓϦͱಉ͡ײ֮Ͱϓ ϩάϥϜΛ࡞੒͢Δ ▸ +BWBͰ͸গ਺೿ ▸ +4'͕୅දྫ 51 ೖྗը໘ ೖྗ߲໨1 ೖྗ߲໨2 ೖྗ߲໨3 όοΩϯά Ϗʔϯ String input1; String input2; String input3;

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ೖྗνΣοΫػೳ ▸ ΄΅શͯͷϑϨʔϜϫʔ ΫͰɺೖྗνΣοΫػ ೳ͕ఏڙ͞Ε͍ͯΔ ▸ ӈͷίʔυ͸  #FBO7BMJEBUJPOͷྫ ▸ 4QSJOH.7$Ͱ΋+4' Ͱ΋࢖͑Δ 52 public class InputForm { @NotNull @Size(min = 1, max = 10) private String input1; @NotNull @Max(99) private Integer number; // setter/getterলུ }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 /PNPSF+41 ▸ ࠷ۙͰ͸ɺ+41͸ੵۃతʹ࠾༻͞Εͳ͍܏޲ ▸ ϏϡʔͱϩδοΫ͕ࠞࡏͰ͖ͯ͠·͏ ▸ σϑΥϧτͰ͸ΤεέʔϓॲཧΛ͠ͳ͍ͨΊɺ  ΫϩεαΠτεΫϦϓςΟϯά੬ऑੑ͕ى͖΍͍͢ ▸ ग़ྗ͢Δ෦෼͸શͯDPVUͰॻ͔ͳ͍ͱ੬ऑੑʹͳΔ ▸ ৄࡉ͸ʮΫϩεαΠτεΫϦϓςΟϯάʯͰάάͬͯͩ͘ ͍͞ 54

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶃڱٛͷ03Ϛούʔ ▸ ࠷΋ϓϩάϥϜ͕୹͘ॻ͚Δ ▸ 42-͢Βॻ͔ͳ͍ ▸ ͨͩ͠ɺͦͷ෼͚ͩ։ൃऀ͔Β ݟ͑ͳ͍෦෼΋ଟ͘ɺϋϚΓͲ ͜Ζ͸ଟ͍ ▸ Ұൠతʹɺਖ਼نԽ͞Ε͍ͯͳ͍ %#ʹ͸޲͔ͳ͍ͱ͞Ε͍ͯΔ ▸ ୅දྫɿ+1"ɺ)JCFSOBUF 56 // JPAͷྫ EntityManager em = …; Employee employee = em.find(Employee.class, 101); ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶄ42-Ϛούʔ ▸ 42-ΛςΩετϑΝΠϧ΍ 9.-ʹॻ͘ ▸ ෳࡶͳ+0*/ɺ෭໰͍߹Θ ͤɺΠϯσοΫεͷ׆༻΋ Մೳ ▸ ࡞੒͢΂͖ϑΝΠϧ͸ɺڱٛ ͷ03ϚούʔΑΓଟ͘ͳΔ ▸ ୅දྫɿ.Z#BUJTɺ%PNB 57 EmployeeDao dao = …; Employee employee = dao.findById(101); // Domaͷྫ @Dao public interface EmployeeDao { Employee findById(int id); } SELECT id, name, joined_date, department_id FROM employee WHERE id = /*id*/999

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 λΠϓᶅλΠϓηʔϑܕ ▸ Ϋϥε΍ϝιουΛར༻ ͯ͠42-Λ૊ΈཱͯΔ ▸ จࣈྻΛॻ͔ͳ͍ͨΊɺه ड़ϛεʹΑΔ࣮ߦ࣌ྫ֎͕ গͳ͘ͳΔ ▸ هड़ྔ͸͔ͳΓ૿͑Δ ▸ ୅දྫɿ2VFSZ%4-ɺ K002ɺ%#'MVUF 58 // QueryDSLͷྫ QCustomer c = new QCustomer("c"); SQLTemplates dialect = …; SQLQuery> query = …; List lastNames = query .select(c.lastName) .from(c) .where(c.firstName.eq("Bob")) .fetch(); https://github.com/querydsl/querydsl/tree/master/querydsl-sql ͔ΒҾ༻

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ͱ͸ʁ 60 // DAOΠϯλϑΣʔε public interface EmployeeDao { Employee findById(int id); } // DAOΠϯλϑΣʔεͷ࣮૷Ϋϥε public class EmployeeDaoImpl implements EmployeeDao { @Override public Employee findById(int id) { // ORϚούʔͰDBΞΫηε͢Δ } }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ͱ͸ʁ 61 // DIΛ࢖͍ͬͯͳ͍ίϯτϩʔϥʔΫϥε public class EmployeeController { public String findById(int id) { EmployeeDao dao = new EmployeeDaoImpl(); Employee employee = dao.findById(id); // ը໘ʹϑΥϫʔυ } }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 %*ͱ͸ʁ 62 // DIΛ࢖͍ͬͯΔίϯτϩʔϥʔΫϥε public class EmployeeController { @Inject EmployeeDao dao; public String findById(int id) { Employee employee = dao.findById(id); // ը໘ʹϑΥϫʔυ } } EmployeeDaoImplͷ Πϯελϯε͕ ࣗಈతʹ୅ೖ͞ΕΔ ϦϑϨΫγϣϯΛ ࢖͍ͬͯΔʢޙड़ʣ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ԾͷΫϥεΛར༻ͨ͠୯ମςετ 64 // DAOΠϯλϑΣʔεͷελϒʢςετ༻ͷԾΫϥεʣ public class StubEmployeeDao implements EmployeeDao { @Override public Employee findById(int id) { // ୯७ͳݻఆ஋Λฦ͢ͷΈ Employee emp = new Employee(); emp.setId(id); emp.setName("ࢁాଠ࿠"); emp.setDepartmentId(10); emp.setJoinedDate(LocalDate.of(2016, 12, 3)); return emp; } }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ελϒΛར༻ͨ͠ίϯτϩʔϥʔͷ୯ମςετ 65 // JUnitͰͷྫ public class EmployeeControllerTest { @Test public void test_findById() { EmployeeController controller = new EmployeeController(); // DAOϑΟʔϧυʹελϒΛ୅ೖ controller.dao = new StubEmployeeDao(); // ίϯτϩʔϥʔϝιουͷςετ String viewName = controller.findById(101); assertThat(viewName, is("index")); } }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ΞϓϦέʔγϣϯαʔόʔ͕΍͍ͬͯΔ͜ͱ ▸ ΞϓϦέʔγϣϯαʔόʔͷىಈࣗମ͕  NBJO ϝιουͷ࣮ߦͱߟ͑Ε͹ྑ͍ ▸ ΞϓϦέʔγϣϯαʔόʔ͸ɺ ᶃXFCYNMΛಡΈࠐΜͰαʔϒϨοτΫϥε໊Λऔಘ͢Δ ᶄΫϥε໊͔ΒαʔϒϨοτͷΠϯελϯεΛੜ੒͢Δ ᶅΠϯελϯεͷEP(FU EP1PTU Λ࣮ߦ͢Δ 71

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ΞϓϦέʔγϣϯαʔόʔ͕΍͍ͬͯΔ͜ͱ 72 †startup.bat ≒mainϝιουىಈ HelloServlet com.example.HelloServlet HelloServlet /hello ᶃweb.xmlಡΈࠐΈ ᶃ’ Ϋϥε໊औಘ αʔϒϨοτ Πϯελϯε ᶄੜ੒ ᶅdoGet/doPost ※࣮ࡍʹ͸ɺΫϥΠΞϯτ͔ΒͦͷαʔϒϨοτ΁ͷॳճϦΫΤετ͕͋ͬͨ࣌ʹɺαʔϒϨοτΠϯελϯε͕ੜ੒͞Ε·͢

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϦϑϨΫγϣϯͷαϯϓϧίʔυ 74 // HelloServletΫϥεΛද͢ClassΠϯελϯεͷऔಘ Class klass = Class.forName("com.example.HelloServlet"); // HelloServletΫϥεͷҾ਺ͳ͠ίϯετϥΫλͷऔಘ Constructor constructor = klass.getConstructor(); // औಘͨ͠ίϯετϥΫλΛར༻ͯ͠ΠϯελϯεΛੜ੒ Object servlet = constructor.newInstance();

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϦϑϨΫγϣϯͷαϯϓϧίʔυ 75 // HelloServletΫϥεͷdoGet()ϝιουΛऔಘ Method method = klass.getMethod("doGet", String.class); // doGet()ϝιουͷ࣮ߦ Object returnValue = method.invoke(servlet, "hoge"); // doGet()ϝιουͷ໭Γ஋Λදࣔ System.out.println(returnValue);

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 +1"ΤϯςΟςΟͷྫ 78 @Entity // ΤϯςΟςΟΫϥεͰ͋Δ͜ͱΛࣔ͢ @Table(name = "employee") // ରԠ͢Δςʔϒϧ໊ public class EmployeeEntity { @Id // ओΩʔͰ͋Δ͜ͱΛࣔ͢ private Integer id; @Column(name = "emp_name") // ྻ໊͕"emp_name" private String name; // getter/setter͸লུ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 Ϋϥεʹ෇͍͍ͯΔΞϊςʔγϣϯͷऔಘ 79 Class klass = (Class) Class.forName("com.example.Employee"); // EntityΞϊςʔγϣϯͷऔಘ Entity entity = klass.getAnnotation(Entity.class); if (entity != null) { System.out.println("͜ͷΫϥε͸ΤϯςΟςΟͰ͢"); } // TableΞϊςʔγϣϯͷऔಘ Table table = klass.getAnnotation(Table.class); System.out.println("ςʔϒϧ໊͸" + table.name());

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϑΟʔϧυʹ෇͍͍ͯΔΞϊςʔγϣϯͷऔಘ 80 Field[] fields = klass.getDeclaredFields(); for (Field field : fields) { String fieldName = field.getName(); Column column = field.getAnnotation(Column.class); String columnName = column.name(); System.out.println(fieldName + "ͷྻ໊͸" + columnName); Id id = field.getAnnotation(Id.class); if (id != null) { System.out.println(fieldName + "͸ओΩʔͰ͢"); } }

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ͳͥϩΪϯάϥΠϒϥϦΛ࢖͏ͷʁ 4ZTUFNPVUQSJOUMO ͡Όμϝʁ ᶃϩάͷϨϕϧΛઃఆͰ͖Δ ▸ ։ൃ؀ڥͰ͸શϩάΛग़ྗɺຊ൪؀ڥͰ͸*/'0ϨϕϧҎ ্ͷΈग़ྗɺͱ͔ ᶄ౷Ұͨ͠ϑΥʔϚοτΛࢦఆͰ͖Δ ▸ ʮ<೥݄೔࣌෼ඵϛϦඵ><Ϋϥε໊>ϝοηʔδʯͱ͔ ᶅϑΝΠϧ΁ͷग़ྗ΍ɺผαʔόʔ΁ͷసૹͳͲ͕Ͱ ͖Δ 85

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ϩΨʔͷऔಘͱϩάͷग़ྗ 89 import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SampleService { private static final Logger LOGGER = LoggerFactory.getLogger(SampleService.class); public void doSomething() { LOGGER.trace("This is trace log."); LOGGER.debug("This is debug log."); LOGGER.info("This is info log."); LOGGER.warn("This is warn log."); LOGGER.error("This is debug log."); } } logback.xmlʹࢦఆͨ͠ ϨϕϧҎ্ͷΈ ग़ྗ͞ΕΔ Ϋϥεͷ׬શम০໊͕ ϩΨʔͷ໊લͱͳΔ

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(C) CASAREAL, Inc. All rights reserved. #ccc_f1 ग़ྗ͞ΕͨϩάϑΝΠϧ 90 2016-12-02 15:03:17.868 INFO com.example.service.SampleService - This is info log. 2016-12-02 15:03:17.868 WARN com.example.service.SampleService - This is warn log. 2016-12-02 15:03:17.868 ERROR com.example.service.SampleService - This is debug log. ▸ MPHCBDLYNMʹࢦఆͨ͠ ▸ ϨϕϧҎ্ͷΈग़ྗ͞ΕΔ ▸ ϝοηʔδͷϑΥʔϚοτͰग़ྗ͞ΕΔ